Day 6

See Screen, See Pic On Screen

	Today we'll put a picture on the screen.

First
	Make a 320x240 bitmap in MSPaint, save in C:\n64asm\ as pic.bmp.
Next, goto Dextrose and download the
patch to the GroundZero Devkit, what we want is the BMP2N64 program. Copy
BMP2N64.exe to your n64 assembly folder. Open a DOS Prompt and type:

cd your assembly folder path
bmp2n64 -in:pic.bmp -out:pic -label:pic -16

Two files should be created, you can delete the .H file, but keep the .S file.
The .S File may work as is, but I recommend you delete the lines before
the label and replace all ".half"s with "dh" (no quotes).

The Code

	The code for this isn't that much different than we've seen before
or that you could have come up with on your own. So here we go (the whole thing):

;;---CODE START---;;
	org $80000400 ; starting point

	li   t1,8         ; crash protection
        lui    t0,$bfc0   ; I still don't know what this specifically does.
        sw   t1,$07fc(t0)

        la   t0,$A4400000  ; start of VI regs. ; this block initializes Video
        li   t1, $103002
        sw   t1,0(t0)
        la   t1,$a0200000 ; the frame buffer address
        sw   t1,4(t0)
        li   t1,320
        sw   t1,8(t0)
        li   t1,$2
        sw   t1,12(t0)
        li   t1,$0
        sw   t1,16(t0)
        li   t1,$3e52239
        sw   t1,20(t0)
        li   t1,$0000020d
        sw   t1,24(t0)
        li   t1,$00000c15
        sw   t1,28(t0)
        li   t1,$0c150c15
        sw   t1,32(t0)
        li   t1,$006c02ec
        sw   t1,36(t0)
        li   t1,$002501ff
        sw   t1,40(t0)
        li   t1,$000e0204
        sw   t1,44(t0)
        li   t1,$200
        sw   t1,48(t0)
        li   t1,$400
        sw   t1,52(t0)

	li t0,0xa0200000
	li t3,2
	la t2,MKImage ; MKImage should be the label in your .S file
	li t1,320*240*2-2
drawImage:
	lh t4,0(t2)
	sh t4,0(t0)   ; there's probably a better way, but oh well :)
	add t2,t2,t3
	add t0,t0,t3
	sub t1,t1,t3  ; there's a better place for this that'll be discussed later
	bnez t1,drawImage

infin:
	nop
	j infin

	include MKImage.S ; MKImage.S should be the filename of your .S File
;;---CODE STOP---;;

This Day In Review

	I hope you take the time to understand code and not just rip it :)!

	Until Next Time!,
		- Mike H a.k.a GbaGuy

Intro - Day 7